G2ROOT(1)						      General Commands Manual							 G2ROOT(1)

NAME

       g2root - convert GEANT geomtry files to ROOT files

SYNOPSIS

       g2rootd [-f map_name] geant_name macro_name

DESCRIPTION

       You  can  convert a GEANT (see http://wwwinfo.cern.ch/asd/geant/index.html fore more on GEANT) geometry to ROOT geometry with the following
       steps

       1      Run the interactive version of GEANT and produce a Zebra RZ file detector.geom, by typing the command:

	      Geant > rz/file 21 detector.geom on

       2      Run the g2root program to convert the Zebra RZ file into a ROOT macro detector.C:

	      g2root detector.geom detector.C

       3      Run the following ROOT session;

	      root [1] .x detector.C
	      root [2] detector.Draw()
	      root [3] c1.x3d()   // (this invokes the 3-d Root viewver)
	      root [4] TFile f("detector.root","NEW") //open a new root file
	      root [5] detector.Write() //Write the geometry structure
	      root [6] f.Write()

       Note that the TNode structure currently in ROOT was not designed as a replacement for a true geometry package. The idea was mainly to  draw
       simple  geometries  in  event display programs. We are currently investigating several alternatives for a true & efficient geometry package
       supporting;

       -      a disk data base with storage of multiple geometry versions

       -      an interactive editor and viewer

       -      with 3-d views

       -      but also 2-d cut views

       -      with interfaces to existing or future MC such as GEANT3 or GEANT4

       A second program called gh2root (see http://root.cern.ch/root/gh2root.html) generates automatically C++ code corresponding  to  the  GEANT3
       Zebra structures JSET, JVERTX, JKINE, JHITS and JDIGI.

SEE ALSO

	      root(1), h2root(1),
       and
	      The ROOT Users Guide
       available from the main ROOT website:
	      http://root.cern.ch

ORIGINAL AUTHORS

       The ROOT team (see web page above):
	      Rene Brun and Fons Rademakers

COPYRIGHT

       This  library  is  free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as pub-
       lished by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

       This library is distributed in the hope that it will be useful, but WITHOUT ANY	WARRANTY;  without  even  the  implied	warranty  of  MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.

       You  should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foun-
       dation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

AUTHOR

       This manual page was written by Christian Holm Christensen <cholm@nbi.dk>, for the Debian GNU/Linux system (but may be used by others).

ROOT
								     Version 3								 G2ROOT(1)